Populate select list with meta values from all posts of a Custom Post Type

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I've got a CPT of Inventory and I'm trying to show a dropdown of all Mfrs. I've got the form and pre_get_posts function so that when a user selects a Mfr, the page refreshes and shows only the inventory with that Mfr. THE PROBLEM: Once you select a Mfr. and the page refreshes, only that mfr shows as an option! No matter what I try (I won't post them all here because I have tried like 10 different…

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